When we’re roused at dawn by our phone’s push notifications and tap the screen to order a steaming breakfast; when we rely on real-time navigation to move through the city’s veins; when we work out and have our activity data automatically uploaded—these seemingly casual taps and swipes have already left a trail of digital footprints. This river of information, woven from the minutiae of everyday life, has become an indispensable component of national security that can no longer be ignored.

   Microdata paints a macro picture.

  Digital footprints typically refer to the data retained on servers after an individual uses digital devices or accesses the internet. They can be categorized into passive digital footprints—such as location data silently collected by mobile apps or preference information captured through website cookies—and active digital footprints—such as social media posts and online shopping records generated by users’ deliberate actions. While these footprints help establish a person’s digital identity, they also accumulate through big‑data technologies, enabling the creation of macro‑level profiles that far exceed what one might imagine.

  — A map of regional economic vitality. Data on population clustering and mobility in commercial districts and industrial parks not only serve as a barometer of consumer dynamism but, by analyzing commuting patterns and logistics flows, can also reveal the state of regional economic development and industrial spatial distribution, thereby becoming critical intelligence that shapes business decisions and even national competitive strategies.

  — A map of societal dynamics. The tidal patterns of pedestrian flows and vehicle trajectories around key transportation hubs and public‑service facilities serve as the basis for optimizing urban governance; they may also function as a “code” for discerning and revealing the underlying principles governing social operations, acting as a “diagnostic report” on systemic risks within society and directly impacting public safety and social stability.

  — Strategic‑site situational map. By continuously collecting and analyzing personnel movements and vehicle trajectories around certain sensitive areas, it is possible to generate an “unconscious mapping” that brings the hidden contours of critical strategic locations to light, indirectly revealing vital information and creating a window through which ill‑intentioned actors can conduct surveillance.

   Trajectory data harbors hidden risks.

  — Conducting targeted profiling to carry out recruitment and subversion. Foreign anti-China hostile forces may, by analyzing relevant digital footprint data, precisely identify individuals who regularly and consistently frequent the vicinity of key defense‑related institutions and research institutes, thereby providing highly accurate “guidance” for subsequent outreach and recruitment efforts aimed at high‑value targets.

  — Threatening critical infrastructure. Foreign anti-China hostile forces may, by conducting long-term surveillance of personnel and vehicle movements in key areas such as communication base stations and transportation hubs, retroactively identify vulnerabilities in internal security systems, thereby facilitating subsequent operations.

  — Manipulating social cognition and public opinion. Hostile anti-China forces operating overseas may leverage large-scale population‑movement data analytics to precisely identify areas of heightened social sentiment, fabricate and disseminate rumors, deliberately steer public discourse, and even orchestrate provocative incidents, thereby undermining social order and posing a threat to national security.

   Protecting digital footprints is everyone’s responsibility.

  In recent years, the state has enacted and implemented laws and regulations such as the Cybersecurity Law, the Data Security Law, and the Personal Information Protection Law, establishing a robust legal framework for data security. Citizens and organizations—particularly relevant entities—should strictly comply with these laws and regulations, fulfill their primary responsibilities for data security, handle user information with due care, strengthen technical safeguards, and prevent unauthorized data collection, misuse, and leakage. Special attention should be paid to mitigating the risks associated with the illicit transfer of data across borders. Citizens are encouraged to enhance their awareness of data security: in daily life, carefully review app permission requests, refrain from granting location access unless absolutely necessary, and, when required, set permissions to “Allow while using the app.” When sharing content online or checking in, avoid precise location tracking, and take particular care not to disclose sensitive locations such as home addresses or workplaces. Regularly review app privacy settings and permission management, and disable unnecessary background data‑collection features.

  Members of the public who discover any clues indicating that organizations or individuals are engaged in activities such as stealing, spying on, or illegally providing location‑tracking data may report such matters through the National Security Agency’s hotline at 12339, the online reporting platform (www.12339.gov.cn), the Ministry of National Security’s official WeChat account, or by directly contacting their local national security authorities.

[Editor-in-charge: Liu Yang]

Source: National Security Ministry WeChat Official Account